Caulking gun



1.1 is a rear view;

1.2 is a front view;

1.3 is a top view;

1.4 is a right side view;

1.5 is a bottom view;

1.6 is a left side view; and

1.7 is a front and right side perspective view. 

CLAIM The ornamental design for a caulking gun, as shown and described. 